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The Cross Bridge Cycle

1.Interaction...

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1.Interactions between myosin head and actin in muscle contraction

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Q. Assertion: Calcium ions play a crucial role in muscle contraction.
Reason: Calcium ions bind troponin causing the displacement of tropomyosin, allowing the myosin head to bind actin.
Select the appropriate option:

Q. When a muscle is at rest, what blocks myosin from binding to actin?

Q. During muscular contraction, the myosin head binds to the exposed active sites on actin to form a?

Q. Arrange the order of events in the cross-bridge cycle:
(i) The myosin head pulls the actin filament towards the M-line.
(ii) The myosin head releases ADP and phosphate.
(iii) The myosin head hydrolyses ATP.
(iv) The myosin head binds actin.

ATPase of the muscle is located in

(a) actinin (b) troponin (c) myosin (d) actin

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The Cross Bridge Cycle

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